problems with xetex and polyglossia

[stefano franchi]

I am having some serious problem with a document that uses both xetex and
polyglossia. Compilation breaks with the following error (from the log):

! Undefined control sequence.

<argument> ***@lng@\***@main@language


The document compiled perfectly last year (It is a grant application, so I
can pinpoint exactly when I successfully compiled it last: 8/15/2013)
I was using TeXLive 2013 at the time, I am now on TL 2014.


A Google searche [1] seems to indicate that this is sometimes due to a
recent problem in biblatex---when the polyglossia command
\selectdefaultlanguage is missing, biblatex fails silently and result in
the quoted message in the log.
However, this is not the case for my document: LyX correctly inserts a
\selectdefaultlanguage in the exported (Xe)LaTeX file. Yet the error
results.

I tried exporting to LaTeX and compiling from the command line and of
course I got the same error message.

*However*:

if I hit 's' and force XeLaTeX to continue, everything goes fine, and the
resulting pdf is perfect.

Anyone has a clue of what may be wrong?

Stefano





[1] https://github.com/plk/biblatex/issues/260
--
__________________________________________________
Stefano Franchi
Associate Research Professor
Department of Hispanic Studies Ph: [phone]
Texas A&M University Fax: [phone]
College Station, Texas, USA

***@tamu.edu
http://stefano.cleinias.org